服务清洁客房时，正确的是：（）

A.知道房间内无人时，服务员可以不敲门进入房间

B.整个清扫过程中，房门必须始终敞开

C.应严格按房间号码顺序清扫房间

D.清扫完毕后应自我检查一遍

The holding power of an anchor is the（）.

A.maximum sustained vertical load an anchor will resist before dragging

B.maximum sustained horizontal load an anchor will resist before dragging

C.maximum sustained vertical load an anchor will resist before the mooring line breaks

D.maximum sustained horizontal load an anchor will resist before the mooring line breaks